An action that assumes it's being fired on a JEditorPane
with a StyledEditorKit (or subclass) installed. This has
some convenience methods for causing character or paragraph
level attribute changes. The convenience methods will
throw an IllegalArgumentException if the assumption of
a StyledDocument, a JEditorPane, or a StyledEditorKit
fail to be true.

The component that gets acted upon by the action
will be the source of the ActionEvent if the source
can be narrowed to a JEditorPane type. If the source
can't be narrowed, the most recently focused text
component is changed. If neither of these are the
case, the action cannot be performed.

Warning:
Serialized objects of this class will not be compatible with
future Swing releases. The current serialization support is
appropriate for short term storage or RMI between applications running
the same version of Swing. As of 1.4, support for long term storage
of all JavaBeansTM
has been added to the java.beans package.
Please see XMLEncoder.

setCharacterAttributes

Applies the given attributes to character
content. If there is a selection, the attributes
are applied to the selection range. If there
is no selection, the attributes are applied to
the input attribute set which defines the attributes
for any new text that gets inserted.

Parameters:

editor - the editor

attr - the attributes

replace - if true, then replace the existing attributes first

setParagraphAttributes

Applies the given attributes to paragraphs. If
there is a selection, the attributes are applied
to the paragraphs that intersect the selection.
if there is no selection, the attributes are applied
to the paragraph at the current caret position.

Submit a bug or featureFor further API reference and developer documentation, see Java SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.